Self-healing of modified sulfur composites with calcium sulfoaluminate cement and superabsorbent polymer
| Autor: | Eunjong Ahn, Myoungsu Shin, Seongwoo Gwon |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Cement
CSA cement Calcium sulfoaluminate Materials science Mechanical Engineering technology industry and agriculture chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Sulfur Industrial and Manufacturing Engineering 0104 chemical sciences law.invention Portland cement chemistry Superabsorbent polymer Optical microscope Mechanics of Materials law Self-healing Ceramics and Composites Composite material 0210 nano-technology |
| Zdroj: | Composites Part B: Engineering. 162:469-483 |
| ISSN: | 1359-8368 |
| DOI: | 10.1016/j.compositesb.2019.01.003 |
| Popis: | This study investigated the applicability of calcium sulfoaluminate (CSA)-based cement and superabsorbent polymer (SAP) to the self-healing of modified sulfur composites. Modified sulfur was used as a binder in the sulfur composites. Eight different mixtures were tested by varying the ratio between CSA expansive agent and Portland cement in the CSA-based binary cement, with or without the addition of SAP. A series of nondestructive evaluation analyses, including optical microscopy, computed tomography, and elastic wave transmission, confirmed the synergetic effect of the CSA cement and SAP on the self-healing of modified sulfur composites in wet environments. Both the CSA cement and SAP remained intact in the hardened sulfur composites, but after crack generation and water infiltration, hydrated cement phases and/or swollen SAP particles were produced in the crack gap. The crack-sealing progressed faster and tighter as the portion of CSA expansive agent increased in the binary cement. In addition, the use of SAP greatly escalated the self-healing performance. The reaction products newly formed in the crack gap reflected the self-healing mechanism of the sulfur composites. |
| Databáze: | OpenAIRE |
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